40 CFR 442.21 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).

Regulations last checked for updates: Feb 12, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026

View all text of Subpart B [§ 442.20 - § 442.26]

§ 442.21 - Effluent limitations attainable by the application of the best practicable control technology currently available (BPT).

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the application of BPT:

Table—Effluent Limitations

Regulated parameter	Maximum daily ¹	Maximum monthly avg. ¹
BOD5	61	22
TSS	58	26
Oil and grease (HEM)	36	16
Fluoranthene	0.076
Phenanthrene	0.34
pH	( ²)	( ²)

¹ Mg/L (ppm).

² Within 6 to 9 at all times.

authority: 33 U.S.C. 1311,1314,1316,1317,1318,1342

source: 65 FR 49700, Aug. 14, 2000, unless otherwise noted.

cite as: 40 CFR 442.21